Theory of Space: Can Foundation Models Construct Spatial Beliefs through Active Exploration? - Zhang, Pingyue; Huang, Zihan; Wang, Yue; Zhang, Jieyu; Xue, Letian; Wang, Zihan; Wang, Qineng; Chandrasegaran, Keshigeyan; Zhang, Ruohan; Choi, Yejin; Krishna, Ranjay; Wu, Jiajun; et al. (International Conference on Learning Representations, 2026)